Kconfig

# SPDX-License-Identifier: GPL-2.0-only
config ARM64
	def_bool y
	select ACPI_CCA_REQUIRED if ACPI
	select ACPI_GENERIC_GSI if ACPI
	select ACPI_GTDT if ACPI
	select ACPI_IORT if ACPI
	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
	select ACPI_MCFG if (ACPI && PCI)
	select ACPI_SPCR_TABLE if ACPI
	select ACPI_PPTT if ACPI
	select ARCH_CLOCKSOURCE_DATA
	select ARCH_HAS_DEBUG_VIRTUAL
	select ARCH_HAS_DEVMEM_IS_ALLOWED
	select ARCH_HAS_DMA_PREP_COHERENT
	select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
	select ARCH_HAS_FAST_MULTIPLIER
	select ARCH_HAS_FORTIFY_SOURCE
	select ARCH_HAS_GCOV_PROFILE_ALL
	select ARCH_HAS_GIGANTIC_PAGE
	select ARCH_HAS_KCOV
	select ARCH_HAS_KEEPINITRD
	select ARCH_HAS_MEMBARRIER_SYNC_CORE
	select ARCH_HAS_PTE_DEVMAP
	select ARCH_HAS_PTE_SPECIAL
	select ARCH_HAS_SETUP_DMA_OPS
	select ARCH_HAS_SET_DIRECT_MAP
	select ARCH_HAS_SET_MEMORY
	select ARCH_HAS_STRICT_KERNEL_RWX
	select ARCH_HAS_STRICT_MODULE_RWX
	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
	select ARCH_HAS_SYNC_DMA_FOR_CPU
	select ARCH_HAS_SYSCALL_WRAPPER
	select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
	select ARCH_HAVE_NMI_SAFE_CMPXCHG
	select ARCH_INLINE_READ_LOCK if !PREEMPT
	select ARCH_INLINE_READ_LOCK_BH if !PREEMPT
	select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPT
	select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPT
	select ARCH_INLINE_READ_UNLOCK if !PREEMPT
	select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPT
	select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPT
	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPT
	select ARCH_INLINE_WRITE_LOCK if !PREEMPT
	select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPT
	select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPT
	select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPT
	select ARCH_INLINE_WRITE_UNLOCK if !PREEMPT
	select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPT
	select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPT
	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPT
	select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPT
	select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPT
	select ARCH_INLINE_SPIN_LOCK if !PREEMPT
	select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPT
	select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPT
	select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPT
	select ARCH_INLINE_SPIN_UNLOCK if !PREEMPT
	select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPT
	select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPT
	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPT
	select ARCH_KEEP_MEMBLOCK
	select ARCH_USE_CMPXCHG_LOCKREF
	select ARCH_USE_QUEUED_RWLOCKS
	select ARCH_USE_QUEUED_SPINLOCKS
	select ARCH_SUPPORTS_MEMORY_FAILURE
	select ARCH_SUPPORTS_ATOMIC_RMW
	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && (GCC_VERSION >= 50000 || CC_IS_CLANG)
	select ARCH_SUPPORTS_NUMA_BALANCING
	select ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT
	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
	select ARCH_WANT_FRAME_POINTERS
	select ARCH_WANT_HUGE_PMD_SHARE if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
	select ARCH_HAS_UBSAN_SANITIZE_ALL
	select ARM_AMBA
	select ARM_ARCH_TIMER
	select ARM_GIC
	select AUDIT_ARCH_COMPAT_GENERIC
	select ARM_GIC_V2M if PCI
	select ARM_GIC_V3
	select ARM_GIC_V3_ITS if PCI
	select ARM_PSCI_FW
	select BUILDTIME_EXTABLE_SORT
	select CLONE_BACKWARDS
	select COMMON_CLK
	select CPU_PM if (SUSPEND || CPU_IDLE)
	select CRC32
	select DCACHE_WORD_ACCESS
	select DMA_DIRECT_REMAP
	select EDAC_SUPPORT
	select FRAME_POINTER
	select GENERIC_ALLOCATOR
	select GENERIC_ARCH_TOPOLOGY
	select GENERIC_CLOCKEVENTS
	select GENERIC_CLOCKEVENTS_BROADCAST
	select GENERIC_CPU_AUTOPROBE
	select GENERIC_CPU_VULNERABILITIES
	select GENERIC_EARLY_IOREMAP
	select GENERIC_IDLE_POLL_SETUP
	select GENERIC_IRQ_MULTI_HANDLER
	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
	select GENERIC_IRQ_SHOW_LEVEL
	select GENERIC_PCI_IOMAP
	select GENERIC_SCHED_CLOCK
	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_STRNCPY_FROM_USER
	select GENERIC_STRNLEN_USER
	select GENERIC_TIME_VSYSCALL
	select GENERIC_GETTIMEOFDAY
	select HANDLE_DOMAIN_IRQ
	select HARDIRQS_SW_RESEND
	select HAVE_PCI
	select HAVE_ACPI_APEI if (ACPI && EFI)
	select HAVE_ALIGNED_STRUCT_PAGE if SLUB
	select HAVE_ARCH_AUDITSYSCALL
	select HAVE_ARCH_BITREVERSE
	select HAVE_ARCH_HUGE_VMAP
	select HAVE_ARCH_JUMP_LABEL
	select HAVE_ARCH_JUMP_LABEL_RELATIVE
	select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
	select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN
	select HAVE_ARCH_KGDB
	select HAVE_ARCH_MMAP_RND_BITS
	select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
	select HAVE_ARCH_PREL32_RELOCATIONS
	select HAVE_ARCH_SECCOMP_FILTER
	select HAVE_ARCH_STACKLEAK
	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
	select HAVE_ARCH_TRACEHOOK
	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
	select HAVE_ARCH_VMAP_STACK
	select HAVE_ARM_SMCCC
	select HAVE_ASM_MODVERSIONS
	select HAVE_EBPF_JIT
	select HAVE_C_RECORDMCOUNT
	select HAVE_CMPXCHG_DOUBLE
	select HAVE_CMPXCHG_LOCAL
	select HAVE_CONTEXT_TRACKING
	select HAVE_DEBUG_BUGVERBOSE
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_CONTIGUOUS
	select HAVE_DYNAMIC_FTRACE
	select HAVE_DYNAMIC_FTRACE_WITH_REGS \
		if $(cc-option,-fpatchable-function-entry=2)
	select HAVE_EFFICIENT_UNALIGNED_ACCESS
	select HAVE_FAST_GUP
	select HAVE_FTRACE_MCOUNT_RECORD
	select HAVE_FUNCTION_TRACER
	select HAVE_FUNCTION_ERROR_INJECTION
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_GCC_PLUGINS
	select HAVE_HW_BREAKPOINT if PERF_EVENTS
	select HAVE_IRQ_TIME_ACCOUNTING
	select HAVE_MEMBLOCK_NODE_MAP if NUMA
	select HAVE_NMI
	select HAVE_PATA_PLATFORM
	select HAVE_PERF_EVENTS
	select HAVE_PERF_REGS
	select HAVE_PERF_USER_STACK_DUMP
	select HAVE_REGS_AND_STACK_ACCESS_API
	select HAVE_FUNCTION_ARG_ACCESS_API
	select HAVE_RCU_TABLE_FREE
	select HAVE_RSEQ
	select HAVE_STACKPROTECTOR
	select HAVE_SYSCALL_TRACEPOINTS
	select HAVE_KPROBES
	select HAVE_KRETPROBES
	select HAVE_GENERIC_VDSO
	select IOMMU_DMA if IOMMU_SUPPORT
	select IRQ_DOMAIN
	select IRQ_FORCED_THREADING
	select MODULES_USE_ELF_RELA
	select NEED_DMA_MAP_STATE
	select NEED_SG_DMA_LENGTH
	select OF
	select OF_EARLY_FLATTREE
	select PCI_DOMAINS_GENERIC if PCI
	select PCI_ECAM if (ACPI && PCI)
	select PCI_SYSCALL if PCI
	select POWER_RESET
	select POWER_SUPPLY
	select SPARSE_IRQ
	select SWIOTLB
	select SYSCTL_EXCEPTION_TRACE
	select THREAD_INFO_IN_TASK
	help
	  ARM 64-bit (AArch64) Linux support.

config 64BIT
	def_bool y

config MMU
	def_bool y

config ARM64_PAGE_SHIFT
	int
	default 16 if ARM64_64K_PAGES
	default 14 if ARM64_16K_PAGES
	default 12

config ARM64_CONT_SHIFT
	int
	default 5 if ARM64_64K_PAGES
	default 7 if ARM64_16K_PAGES
	default 4

config ARCH_MMAP_RND_BITS_MIN
       default 14 if ARM64_64K_PAGES
       default 16 if ARM64_16K_PAGES
       default 18

# max bits determined by the following formula:
#  VA_BITS - PAGE_SHIFT - 3
config ARCH_MMAP_RND_BITS_MAX
       default 19 if ARM64_VA_BITS=36
       default 24 if ARM64_VA_BITS=39
       default 27 if ARM64_VA_BITS=42
       default 30 if ARM64_VA_BITS=47
       default 29 if ARM64_VA_BITS=48 && ARM64_64K_PAGES
       default 31 if ARM64_VA_BITS=48 && ARM64_16K_PAGES
       default 33 if ARM64_VA_BITS=48
       default 14 if ARM64_64K_PAGES
       default 16 if ARM64_16K_PAGES
       default 18

config ARCH_MMAP_RND_COMPAT_BITS_MIN
       default 7 if ARM64_64K_PAGES
       default 9 if ARM64_16K_PAGES
       default 11

config ARCH_MMAP_RND_COMPAT_BITS_MAX
       default 16

config NO_IOPORT_MAP
	def_bool y if !PCI

config STACKTRACE_SUPPORT
	def_bool y

config ILLEGAL_POINTER_VALUE
	hex
	default 0xdead000000000000

config LOCKDEP_SUPPORT
	def_bool y

config TRACE_IRQFLAGS_SUPPORT
	def_bool y

config GENERIC_BUG
	def_bool y
	depends on BUG

config GENERIC_BUG_RELATIVE_POINTERS
	def_bool y
	depends on GENERIC_BUG

config GENERIC_HWEIGHT
	def_bool y

config GENERIC_CSUM
        def_bool y

config GENERIC_CALIBRATE_DELAY
	def_bool y

config ZONE_DMA
	bool "Support DMA zone" if EXPERT
	default y

config ZONE_DMA32
	bool "Support DMA32 zone" if EXPERT
	default y

config ARCH_ENABLE_MEMORY_HOTPLUG
	def_bool y

config SMP
	def_bool y

config KERNEL_MODE_NEON
	def_bool y

config FIX_EARLYCON_MEM
	def_bool y

config PGTABLE_LEVELS
	int
	default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36
	default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
	default 3 if ARM64_64K_PAGES && (ARM64_VA_BITS_48 || ARM64_VA_BITS_52)
	default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
	default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47
	default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48

config ARCH_SUPPORTS_UPROBES
	def_bool y

config ARCH_PROC_KCORE_TEXT
	def_bool y

config KASAN_SHADOW_OFFSET
	hex
	depends on KASAN
	default 0xdfffa00000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && !KASAN_SW_TAGS
	default 0xdfffd00000000000 if ARM64_VA_BITS_47 && !KASAN_SW_TAGS
	default 0xdffffe8000000000 if ARM64_VA_BITS_42 && !KASAN_SW_TAGS
	default 0xdfffffd000000000 if ARM64_VA_BITS_39 && !KASAN_SW_TAGS
	default 0xdffffffa00000000 if ARM64_VA_BITS_36 && !KASAN_SW_TAGS
	default 0xefff900000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && KASAN_SW_TAGS
	default 0xefffc80000000000 if ARM64_VA_BITS_47 && KASAN_SW_TAGS
	default 0xeffffe4000000000 if ARM64_VA_BITS_42 && KASAN_SW_TAGS
	default 0xefffffc800000000 if ARM64_VA_BITS_39 && KASAN_SW_TAGS
	default 0xeffffff900000000 if ARM64_VA_BITS_36 && KASAN_SW_TAGS
	default 0xffffffffffffffff

source "arch/arm64/Kconfig.platforms"

menu "Kernel Features"

menu "ARM errata workarounds via the alternatives framework"

config ARM64_WORKAROUND_CLEAN_CACHE
	bool

config ARM64_ERRATUM_826319
	bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
	default y
	select ARM64_WORKAROUND_CLEAN_CACHE
	help
	  This option adds an alternative code sequence to work around ARM
	  erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
	  AXI master interface and an L2 cache.

	  If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
	  and is unable to accept a certain write via this interface, it will
	  not progress on read data presented on the read data channel and the
	  system can deadlock.

	  The workaround promotes data cache clean instructions to
	  data cache clean-and-invalidate.
	  Please note that this does not necessarily enable the workaround,
	  as it depends on the alternative framework, which will only patch
	  the kernel if an affected CPU is detected.

	  If unsure, say Y.

config ARM64_ERRATUM_827319
	bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
	default y
	select ARM64_WORKAROUND_CLEAN_CACHE
	help
	  This option adds an alternative code sequence to work around ARM
	  erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
	  master interface and an L2 cache.

	  Under certain conditions this erratum can cause a clean line eviction
	  to occur at the same time as another transaction to the same address
	  on the AMBA 5 CHI interface, which can cause data corruption if the
	  interconnect reorders the two transactions.

	  The workaround promotes data cache clean instructions to
	  data cache clean-and-invalidate.
	  Please note that this does not necessarily enable the workaround,
	  as it depends on the alternative framework, which will only patch
	  the kernel if an affected CPU is detected.

	  If unsure, say Y.

config ARM64_ERRATUM_824069
	bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
	default y
	select ARM64_WORKAROUND_CLEAN_CACHE
	help
	  This option adds an alternative code sequence to work around ARM
	  erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
	  to a coherent interconnect.

	  If a Cortex-A53 processor is executing a store or prefetch for
	  write instruction at the same time as a processor in another
	  cluster is executing a cache maintenance operation to the same
	  address, then this erratum might cause a clean cache line to be
	  incorrectly marked as dirty.

	  The workaround promotes data cache clean instructions to
	  data cache clean-and-invalidate.
	  Please note that this option does not necessarily enable the
	  workaround, as it depends on the alternative framework, which will
	  only patch the kernel if an affected CPU is detected.

	  If unsure, say Y.

config ARM64_ERRATUM_819472
	bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
	default y
	select ARM64_WORKAROUND_CLEAN_CACHE
	help
	  This option adds an alternative code sequence to work around ARM
	  erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
	  present when it is connected to a coherent interconnect.

	  If the processor is executing a load and store exclusive sequence at
	  the same time as a processor in another cluster is executing a cache
	  maintenance operation to the same address, then this erratum might
	  cause data corruption.

	  The workaround promotes data cache clean instructions to
	  data cache clean-and-invalidate.
	  Please note that this does not necessarily enable the workaround,
	  as it depends on the alternative framework, which will only patch
	  the kernel if an affected CPU is detected.

	  If unsure, say Y.

config ARM64_ERRATUM_832075
	bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
	default y
	help
	  This option adds an alternative code sequence to work around ARM
	  erratum 832075 on Cortex-A57 parts up to r1p2.

	  Affected Cortex-A57 parts might deadlock when exclusive load/store
	  instructions to Write-Back memory are mixed with Device loads.

	  The workaround is to promote device loads to use Load-Acquire
	  semantics.
	  Please note that this does not necessarily enable the workaround,
	  as it depends on the alternative framework, which will only patch
	  the kernel if an affected CPU is detected.

	  If unsure, say Y.

config ARM64_ERRATUM_834220
	bool "Cortex-A57: 834220: Stage 2 translation fault might be incorrectly reported in presence of a Stage 1 fault"
	depends on KVM
	default y
	help
	  This option adds an alternative code sequence to work around ARM
	  erratum 834220 on Cortex-A57 parts up to r1p2.

	  Affected Cortex-A57 parts might report a Stage 2 translation
	  fault as the result of a Stage 1 fault for load crossing a
	  page boundary when there is a permission or device memory
	  alignment fault at Stage 1 and a translation fault at Stage 2.

	  The workaround is to verify that the Stage 1 translation
	  doesn't generate a fault before handling the Stage 2 fault.
	  Please note that this does not necessarily enable the workaround,
	  as it depends on the alternative framework, which will only patch
	  the kernel if an affected CPU is detected.

	  If unsure, say Y.

config ARM64_ERRATUM_845719
	bool "Cortex-A53: 845719: a load might read incorrect data"
	depends on COMPAT
	default y
	help
	  This option adds an alternative code sequence to work around ARM
	  erratum 845719 on Cortex-A53 parts up to r0p4.

	  When running a compat (AArch32) userspace on an affected Cortex-A53
	  part, a load at EL0 from a virtual address that matches the bottom 32
	  bits of the virtual address used by a recent load at (AArch64) EL1
	  might return incorrect data.

	  The workaround is to write the contextidr_el1 register on exception
	  return to a 32-bit task.
	  Please note that this does not necessarily enable the workaround,
	  as it depends on the alternative framework, which will only patch
	  the kernel if an affected CPU is detected.

	  If unsure, say Y.

config ARM64_ERRATUM_843419
	bool "Cortex-A53: 843419: A load or store might access an incorrect address"
	default y
	select ARM64_MODULE_PLTS if MODULES
	help
	  This option links the kernel with '--fix-cortex-a53-843419' and
	  enables PLT support to replace certain ADRP instructions, which can
	  cause subsequent memory accesses to use an incorrect address on
	  Cortex-A53 parts up to r0p4.

	  If unsure, say Y.

config ARM64_ERRATUM_1024718
	bool "Cortex-A55: 1024718: Update of DBM/AP bits without break before make might result in incorrect update"
	default y
	help
	  This option adds a workaround for ARM Cortex-A55 Erratum 1024718.

	  Affected Cortex-A55 cores (r0p0, r0p1, r1p0) could cause incorrect
	  update of the hardware dirty bit when the DBM/AP bits are updated
	  without a break-before-make. The workaround is to disable the usage
	  of hardware DBM locally on the affected cores. CPUs not affected by
	  this erratum will continue to use the feature.

	  If unsure, say Y.

config ARM64_ERRATUM_1418040
	bool "Cortex-A76/Neoverse-N1: MRC read following MRRC read of specific Generic Timer in AArch32 might give incorrect result"
	default y
	depends on COMPAT
	help
	  This option adds a workaround for ARM Cortex-A76/Neoverse-N1
	  errata 1188873 and 1418040.

	  Affected Cortex-A76/Neoverse-N1 cores (r0p0 to r3p1) could
	  cause register corruption when accessing the timer registers
	  from AArch32 userspace.

	  If unsure, say Y.

config ARM64_ERRATUM_1165522
	bool "Cortex-A76: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
	default y
	help
	  This option adds a workaround for ARM Cortex-A76 erratum 1165522.

	  Affected Cortex-A76 cores (r0p0, r1p0, r2p0) could end-up with
	  corrupted TLBs by speculating an AT instruction during a guest
	  context switch.

	  If unsure, say Y.

config ARM64_ERRATUM_1286807
	bool "Cortex-A76: Modification of the translation table for a virtual address might lead to read-after-read ordering violation"
	default y
	select ARM64_WORKAROUND_REPEAT_TLBI
	help
	  This option adds a workaround for ARM Cortex-A76 erratum 1286807.

	  On the affected Cortex-A76 cores (r0p0 to r3p0), if a virtual
	  address for a cacheable mapping of a location is being
	  accessed by a core while another core is remapping the virtual
	  address to a new physical page using the recommended
	  break-before-make sequence, then under very rare circumstances
	  TLBI+DSB completes before a read using the translation being
	  invalidated has been observed by other observers. The
	  workaround repeats the TLBI+DSB operation.

config ARM64_ERRATUM_1319367
	bool "Cortex-A57/A72: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
	default y
	help
	  This option adds work arounds for ARM Cortex-A57 erratum 1319537
	  and A72 erratum 1319367

	  Cortex-A57 and A72 cores could end-up with corrupted TLBs by
	  speculating an AT instruction during a guest context switch.

	  If unsure, say Y.

config ARM64_ERRATUM_1463225
	bool "Cortex-A76: Software Step might prevent interrupt recognition"
	default y
	help
	  This option adds a workaround for Arm Cortex-A76 erratum 1463225.

	  On the affected Cortex-A76 cores (r0p0 to r3p1), software stepping
	  of a system call instruction (SVC) can prevent recognition of
	  subsequent interrupts when software stepping is disabled in the
	  exception handler of the system call and either kernel debugging
	  is enabled or VHE is in use.

	  Work around the erratum by triggering a dummy step exception
	  when handling a system call from a task that is being stepped
	  in a VHE configuration of the kernel.

	  If unsure, say Y.

config ARM64_ERRATUM_1542419
	bool "Neoverse-N1: workaround mis-ordering of instruction fetches"
	default y
	help
	  This option adds a workaround for ARM Neoverse-N1 erratum
	  1542419.

	  Affected Neoverse-N1 cores could execute a stale instruction when
	  modified by another CPU. The workaround depends on a firmware
	  counterpart.

	  Workaround the issue by hiding the DIC feature from EL0. This
	  forces user-space to perform cache maintenance.

	  If unsure, say Y.

config CAVIUM_ERRATUM_22375
	bool "Cavium erratum 22375, 24313"
	default y
	help
	  Enable workaround for errata 22375 and 24313.

	  This implements two gicv3-its errata workarounds for ThunderX. Both
	  with a small impact affecting only ITS table allocation.

	    erratum 22375: only alloc 8MB table size
	    erratum 24313: ignore memory access type

	  The fixes are in ITS initialization and basically ignore memory access
	  type and table size provided by the TYPER and BASER registers.

	  If unsure, say Y.

config CAVIUM_ERRATUM_23144
	bool "Cavium erratum 23144: ITS SYNC hang on dual socket system"
	depends on NUMA
	default y
	help
	  ITS SYNC command hang for cross node io and collections/cpu mapping.

	  If unsure, say Y.

config CAVIUM_ERRATUM_23154
	bool "Cavium erratum 23154: Access to ICC_IAR1_EL1 is not sync'ed"
	default y
	help
	  The gicv3 of ThunderX requires a modified version for
	  reading the IAR status to ensure data synchronization
	  (access to icc_iar1_el1 is not sync'ed before and after).

	  If unsure, say Y.

config CAVIUM_ERRATUM_27456
	bool "Cavium erratum 27456: Broadcast TLBI instructions may cause icache corruption"
	default y
	help
	  On ThunderX T88 pass 1.x through 2.1 parts, broadcast TLBI
	  instructions may cause the icache to become corrupted if it
	  contains data for a non-current ASID.  The fix is to
	  invalidate the icache when changing the mm context.

	  If unsure, say Y.

config CAVIUM_ERRATUM_30115
	bool "Cavium erratum 30115: Guest may disable interrupts in host"
	default y
	help
	  On ThunderX T88 pass 1.x through 2.2, T81 pass 1.0 through
	  1.2, and T83 Pass 1.0, KVM guest execution may disable
	  interrupts in host. Trapping both GICv3 group-0 and group-1
	  accesses sidesteps the issue.

	  If unsure, say Y.

config CAVIUM_TX2_ERRATUM_219
	bool "Cavium ThunderX2 erratum 219: PRFM between TTBR change and ISB fails"
	default y
	help
	  On Cavium ThunderX2, a load, store or prefetch instruction between a
	  TTBR update and the corresponding context synchronizing operation can
	  cause a spurious Data Abort to be delivered to any hardware thread in
	  the CPU core.

	  Work around the issue by avoiding the problematic code sequence and
	  trapping KVM guest TTBRx_EL1 writes to EL2 when SMT is enabled. The
	  trap handler performs the corresponding register access, skips the
	  instruction and ensures context synchronization by virtue of the
	  exception return.

	  If unsure, say Y.

config QCOM_FALKOR_ERRATUM_1003
	bool "Falkor E1003: Incorrect translation due to ASID change"
	default y
	help
	  On Falkor v1, an incorrect ASID may be cached in the TLB when ASID
	  and BADDR are changed together in TTBRx_EL1. Since we keep the ASID
	  in TTBR1_EL1, this situation only occurs in the entry trampoline and
	  then only for entries in the walk cache, since the leaf translation
	  is unchanged. Work around the erratum by invalidating the walk cache
	  entries for the trampoline before entering the kernel proper.

config ARM64_WORKAROUND_REPEAT_TLBI
	bool

config QCOM_FALKOR_ERRATUM_1009
	bool "Falkor E1009: Prematurely complete a DSB after a TLBI"
	default y
	select ARM64_WORKAROUND_REPEAT_TLBI
	help
	  On Falkor v1, the CPU may prematurely complete a DSB following a
	  TLBI xxIS invalidate maintenance operation. Repeat the TLBI operation
	  one more time to fix the issue.

	  If unsure, say Y.

config QCOM_QDF2400_ERRATUM_0065
	bool "QDF2400 E0065: Incorrect GITS_TYPER.ITT_Entry_size"
	default y
	help
	  On Qualcomm Datacenter Technologies QDF2400 SoC, ITS hardware reports
	  ITE size incorrectly. The GITS_TYPER.ITT_Entry_size field should have
	  been indicated as 16Bytes (0xf), not 8Bytes (0x7).

	  If unsure, say Y.

config SOCIONEXT_SYNQUACER_PREITS
	bool "Socionext Synquacer: Workaround for GICv3 pre-ITS"
	default y
	help
	  Socionext Synquacer SoCs implement a separate h/w block to generate
	  MSI doorbell writes with non-zero values for the device ID.

	  If unsure, say Y.

config HISILICON_ERRATUM_161600802
	bool "Hip07 161600802: Erroneous redistributor VLPI base"
	default y
	help
	  The HiSilicon Hip07 SoC uses the wrong redistributor base
	  when issued ITS commands such as VMOVP and VMAPP, and requires
	  a 128kB offset to be applied to the target address in this commands.

	  If unsure, say Y.

config QCOM_FALKOR_ERRATUM_E1041
	bool "Falkor E1041: Speculative instruction fetches might cause errant memory access"
	default y
	help
	  Falkor CPU may speculatively fetch instructions from an improper
	  memory location when MMU translation is changed from SCTLR_ELn[M]=1
	  to SCTLR_ELn[M]=0. Prefix an ISB instruction to fix the problem.

	  If unsure, say Y.

config FUJITSU_ERRATUM_010001
	bool "Fujitsu-A64FX erratum E#010001: Undefined fault may occur wrongly"
	default y
	help
	  This option adds a workaround for Fujitsu-A64FX erratum E#010001.
	  On some variants of the Fujitsu-A64FX cores ver(1.0, 1.1), memory
	  accesses may cause undefined fault (Data abort, DFSC=0b111111).
	  This fault occurs under a specific hardware condition when a
	  load/store instruction performs an address translation using:
	  case-1  TTBR0_EL1 with TCR_EL1.NFD0 == 1.
	  case-2  TTBR0_EL2 with TCR_EL2.NFD0 == 1.
	  case-3  TTBR1_EL1 with TCR_EL1.NFD1 == 1.
	  case-4  TTBR1_EL2 with TCR_EL2.NFD1 == 1.

	  The workaround is to ensure these bits are clear in TCR_ELx.
	  The workaround only affects the Fujitsu-A64FX.

	  If unsure, say Y.

endmenu


choice
	prompt "Page size"
	default ARM64_4K_PAGES
	help
	  Page size (translation granule) configuration.

config ARM64_4K_PAGES
	bool "4KB"
	help
	  This feature enables 4KB pages support.

config ARM64_16K_PAGES
	bool "16KB"
	help
	  The system will use 16KB pages support. AArch32 emulation
	  requires applications compiled with 16K (or a multiple of 16K)
	  aligned segments.

config ARM64_64K_PAGES
	bool "64KB"
	help
	  This feature enables 64KB pages support (4KB by default)
	  allowing only two levels of page tables and faster TLB
	  look-up. AArch32 emulation requires applications compiled
	  with 64K aligned segments.

endchoice

choice
	prompt "Virtual address space size"
	default ARM64_VA_BITS_39 if ARM64_4K_PAGES
	default ARM64_VA_BITS_47 if ARM64_16K_PAGES
	default ARM64_VA_BITS_42 if ARM64_64K_PAGES
	help
	  Allows choosing one of multiple possible virtual address
	  space sizes. The level of translation table is determined by
	  a combination of page size and virtual address space size.

config ARM64_VA_BITS_36
	bool "36-bit" if EXPERT
	depends on ARM64_16K_PAGES

config ARM64_VA_BITS_39
	bool "39-bit"
	depends on ARM64_4K_PAGES

config ARM64_VA_BITS_42
	bool "42-bit"
	depends on ARM64_64K_PAGES

config ARM64_VA_BITS_47
	bool "47-bit"
	depends on ARM64_16K_PAGES

config ARM64_VA_BITS_48
	bool "48-bit"

config ARM64_VA_BITS_52
	bool "52-bit"
	depends on ARM64_64K_PAGES && (ARM64_PAN || !ARM64_SW_TTBR0_PAN)
	help
	  Enable 52-bit virtual addressing for userspace when explicitly
	  requested via a hint to mmap(). The kernel will also use 52-bit
	  virtual addresses for its own mappings (provided HW support for
	  this feature is available, otherwise it reverts to 48-bit).

	  NOTE: Enabling 52-bit virtual addressing in conjunction with
	  ARMv8.3 Pointer Authentication will result in the PAC being
	  reduced from 7 bits to 3 bits, which may have a significant
	  impact on its susceptibility to brute-force attacks.

	  If unsure, select 48-bit virtual addressing instead.

endchoice

config ARM64_FORCE_52BIT
	bool "Force 52-bit virtual addresses for userspace"
	depends on ARM64_VA_BITS_52 && EXPERT
	help
	  For systems with 52-bit userspace VAs enabled, the kernel will attempt
	  to maintain compatibility with older software by providing 48-bit VAs
	  unless a hint is supplied to mmap.

	  This configuration option disables the 48-bit compatibility logic, and
	  forces all userspace addresses to be 52-bit on HW that supports it. One
	  should only enable this configuration option for stress testing userspace
	  memory management code. If unsure say N here.

config ARM64_VA_BITS
	int
	default 36 if ARM64_VA_BITS_36
	default 39 if ARM64_VA_BITS_39
	default 42 if ARM64_VA_BITS_42
	default 47 if ARM64_VA_BITS_47
	default 48 if ARM64_VA_BITS_48
	default 52 if ARM64_VA_BITS_52

choice
	prompt "Physical address space size"
	default ARM64_PA_BITS_48
	help
	  Choose the maximum physical address range that the kernel will
	  support.

config ARM64_PA_BITS_48
	bool "48-bit"

config ARM64_PA_BITS_52
	bool "52-bit (ARMv8.2)"
	depends on ARM64_64K_PAGES
	depends on ARM64_PAN || !ARM64_SW_TTBR0_PAN
	help
	  Enable support for a 52-bit physical address space, introduced as
	  part of the ARMv8.2-LPA extension.

	  With this enabled, the kernel will also continue to work on CPUs that
	  do not support ARMv8.2-LPA, but with some added memory overhead (and
	  minor performance overhead).

endchoice

config ARM64_PA_BITS
	int
	default 48 if ARM64_PA_BITS_48
	default 52 if ARM64_PA_BITS_52

choice
	prompt "Endianness"
	default CPU_LITTLE_ENDIAN
	help
	  Select the endianness of data accesses performed by the CPU. Userspace
	  applications will need to be compiled and linked for the endianness
	  that is selected here.

config CPU_BIG_ENDIAN
       bool "Build big-endian kernel"
       help
	  Say Y if you plan on running a kernel with a big-endian userspace.

config CPU_LITTLE_ENDIAN
	bool "Build little-endian kernel"
	help
	  Say Y if you plan on running a kernel with a little-endian userspace.
	  This is usually the case for distributions targeting arm64.

endchoice

config SCHED_MC
	bool "Multi-core scheduler support"
	help
	  Multi-core scheduler support improves the CPU scheduler's decision
	  making when dealing with multi-core CPU chips at a cost of slightly
	  increased overhead in some places. If unsure say N here.

config SCHED_SMT
	bool "SMT scheduler support"
	help
	  Improves the CPU scheduler's decision making when dealing with
	  MultiThreading at a cost of slightly increased overhead in some
	  places. If unsure say N here.

config NR_CPUS
	int "Maximum number of CPUs (2-4096)"
	range 2 4096
	default "256"

config HOTPLUG_CPU
	bool "Support for hot-pluggable CPUs"
	select GENERIC_IRQ_MIGRATION
	help
	  Say Y here to experiment with turning CPUs off and on.  CPUs
	  can be controlled through /sys/devices/system/cpu.

# Common NUMA Features
config NUMA
	bool "Numa Memory Allocation and Scheduler Support"
	select ACPI_NUMA if ACPI
	select OF_NUMA
	help
	  Enable NUMA (Non Uniform Memory Access) support.

	  The kernel will try to allocate memory used by a CPU on the
	  local memory of the CPU and add some more
	  NUMA awareness to the kernel.

config NODES_SHIFT
	int "Maximum NUMA Nodes (as a power of 2)"
	range 1 10
	default "2"
	depends on NEED_MULTIPLE_NODES
	help
	  Specify the maximum number of NUMA Nodes available on the target
	  system.  Increases memory reserved to accommodate various tables.

config USE_PERCPU_NUMA_NODE_ID
	def_bool y
	depends on NUMA

config HAVE_SETUP_PER_CPU_AREA
	def_bool y
	depends on NUMA

config NEED_PER_CPU_EMBED_FIRST_CHUNK
	def_bool y
	depends on NUMA

config HOLES_IN_ZONE
	def_bool y

source "kernel/Kconfig.hz"

config ARCH_SUPPORTS_DEBUG_PAGEALLOC
	def_bool y

config ARCH_SPARSEMEM_ENABLE
	def_bool y
	select SPARSEMEM_VMEMMAP_ENABLE

config ARCH_SPARSEMEM_DEFAULT
	def_bool ARCH_SPARSEMEM_ENABLE

config ARCH_SELECT_MEMORY_MODEL
	def_bool ARCH_SPARSEMEM_ENABLE

config ARCH_FLATMEM_ENABLE
	def_bool !NUMA

config HAVE_ARCH_PFN_VALID
	def_bool y

config HW_PERF_EVENTS
	def_bool y
	depends on ARM_PMU

config SYS_SUPPORTS_HUGETLBFS
	def_bool y

config ARCH_WANT_HUGE_PMD_SHARE

config ARCH_HAS_CACHE_LINE_SIZE
	def_bool y

config ARCH_ENABLE_SPLIT_PMD_PTLOCK
	def_bool y if PGTABLE_LEVELS > 2

config SECCOMP
	bool "Enable seccomp to safely compute untrusted bytecode"
	---help---
	  This kernel feature is useful for number crunching applications